JP2001347915A - Air bag system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag system capable of easily assembling an inflator main body for constituting an inflator and a diffuser and capable of stably supporting the inflator main body. SOLUTION: This air bag system M1 is provided with an air bag 11 and an inflator 20. The inflator 20 is provided with an inflator main body 21 having a gas discharge port 24 capable of discharging inflation gas on the tip side, and a diffuser 38 for covering the inflator main body and guiding inflation gas discharged from the gas discharge port to a gas inflow part 14 of the air bag. The inflator 20 is assembled b bringing the whole periphery of the outer peripheral surface 25a on the root side from the gas discharge port in the tip side part 22 of the inflator main body into pressure-contact with the whole periphery of the inner peripheral surface 40a of the diffuser and fixing the root side part 29 of the inflator main body to the diffuser by a recessed part 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag apparatus provided with an airbag folded and stored so as to be deployable and inflatable, and an inflator for supplying an inflation gas to the airbag.

[0002]

2. Description of the Related Art A conventional airbag apparatus is provided with an airbag folded and stored so as to be deployable and inflatable, and an inflator for supplying an inflation gas to the airbag.

As an inflator, a cylindrical inflator body having a gas discharge port capable of discharging an inflation gas disposed on an outer peripheral surface, an inflator gas covering the inflator body and being discharged from the inflator body. There has been a configuration including a cylindrical diffuser disposed so as to flow out to the distal end side along the axial direction of the main body (see Japanese Patent Application Laid-Open No. 11-32153).

In the inflator of the above publication, the inflator body and the diffuser are assembled by a male screw formed on the outer peripheral surface of the inflator body closer to the base from the gas discharge port, and a female screw formed on the inner peripheral surface of the diffuser. Were screwed together.

[0005]

However, in the assembly of the inflator disclosed in the above publication, the inflator body is
Since only the base side was screwed into the diffuser and supported in a cantilever shape, in order to stabilize the support state of the inflator main body, the axial center lengths of the male screw of the inflator main body and the female screw of the diffuser were each set. Had been long.

In addition, since it is necessary to seal the inflation gas discharged from the gas discharge port at the screwed portion, the axial center length of the male screw of the inflator body and the female screw of the diffuser must be long.

Therefore, when the female screw and the male screw are screwed together,
Rotating the inflator body and the diffuser relatively long requires time and effort, and the workability of assembling the inflator body and the diffuser is poor.

The present invention has been made to solve the above-mentioned problems, and can easily assemble an inflator body and a diffuser constituting an inflator, and
An object of the present invention is to provide an airbag device that can stably support an inflator body.

[0009]

SUMMARY OF THE INVENTION An airbag device according to the present invention comprises an airbag which is folded and housed and which can be deployed and inflated, and a tubular gas inflow portion provided in the airbag. A cylinder-type inflator for supplying an inflation gas to the airbag, wherein the inflator is provided with a gas discharge port capable of discharging the inflation gas at a distal end side. A cylindrical inflator body, and a substantially cylindrical diffuser that covers the inflator body and guides the inflation gas discharged from the gas discharge port to the gas inflow section, and is configured to include the inflator body and the inflator body. With the diffuser, the entire circumference of the outer peripheral surface closer to the base portion than the gas discharge port at the tip side portion of the inflator body, the diffuser of the diffuser It is pressed against the entire circumference periphery, and a source side portion of the inflator body, and is fixed to the diffuser by fixing means, characterized in that it is assembled.

It is preferable that the outer peripheral surface of the inflator body and the inner peripheral surface of the diffuser to be pressed against each other are tapered surfaces whose diameter is reduced toward the distal end of the inflator main body.

Preferably, the diffuser is provided with a mounting portion for mounting the inflator to a vehicle.

[0012] Further, the fixing means may be provided on the diffuser base portion side and be plastically deformed.
It is desirable to configure.

[0013]

In the airbag device according to the present invention, when assembling the inflator, the entire periphery of the outer peripheral surface closer to the base portion than the gas discharge port at the distal end portion of the inflator body is set to the entire periphery of the inner peripheral surface of the diffuser. The inflator body and the diffuser are assembled by being pressed against each other and fixing the base side portion of the inflator body to the diffuser by fixing means.

That is, after the assembly is completed, the inflator body is supported by the diffuser at two locations on both ends of the distal end portion and the base portion, so that it is stably supported in the diffuser. .

Further, if the front end portion of the inflator body is pressed against the diffuser, and the base portion of the inflator body is fixed to the diffuser by using fixing means, both can be assembled. As described above, it is not necessary to relatively rotate the inflator body and the diffuser for a long time, and both can be easily assembled.

Therefore, in the airbag device according to the present invention, the inflator body and the diffuser constituting the inflator can be easily assembled, and the inflator body can be stably supported.

Of course, when the assembly is completed, the entire circumference of the outer peripheral surface closer to the base portion than the gas discharge port at the distal end portion of the inflator body is pressed against the entire circumference of the inner peripheral surface of the diffuser. The inflation gas does not leak from the pressure contact portion to the base of the inflator body, and the sealing property of the inflation gas can be ensured.

If the outer peripheral surface of the inflator body to be pressed and the inner peripheral surface of the diffuser are tapered to reduce the diameter toward the front end of the inflator main body, the inflator main body is simply pushed from the base end of the diffuser to the front end side. Since the distal end portion of the inflator body can be easily pressed against the diffuser, the workability of assembling the inflator body and the diffuser can be further improved.

Further, if the mounting portion for mounting the inflator to the vehicle is provided in the diffuser, the number of components of the airbag device can be reduced, and the workability of mounting the airbag device to the vehicle can be improved. .

In the conventional assembling of the inflator by screwing with relative rotation, it is difficult to always keep the relative angular position of the inflator body and the diffuser along the circumferential direction constant. for that reason,
The connection direction of the operation lead wire to the inflator body is
If the diffuser with the inflator body is set in a fixed direction with respect to the vehicle in the circumferential direction of the inflator body, when the diffuser to which the inflator body is assembled is fixed to the vehicle, a separate mounting member such as a mounting bracket separate from the diffuser must be prepared. I had to. And conventionally, after the assembly of the inflator body and the diffuser is completed, the angular position with respect to the diffuser is adjusted while considering the circumferential angle of the inflator body, not the circumferential angular position of the diffuser, and the mounting member is attached. It was assembled to the diffuser, and the mounting member was fixed to the vehicle.

However, in the inflator of the airbag device according to the present invention, the outer peripheral surface of the front end portion of the inflator body is simply pressed against the inner peripheral surface of the diffuser, and the base portion of the inflator main body is fixed by the fixing means. It is fixed to the diffuser and assembled together, and even if the connecting direction of the operating lead wire to the inflator main body is set to a fixed direction with respect to the vehicle in the circumferential direction of the inflator main body, it has a mounting portion. If the inflator body is attached to the diffuser at a predetermined angle in the circumferential direction, then simply attach the mounting part to the vehicle and easily connect the inflator with the connection direction of the operating lead wire in the predetermined direction. It is possible to attach it to the vehicle, and the work of attaching the airbag device including the inflator to the vehicle It can be remarkably improved sexual.

Further, if the fixing means is constituted by a portion provided on the diffuser base portion side to be plastically deformed, it can be simply formed by plastic working such as caulking or the like, without using a separate member, and without using a separate member. The part can be fixed to the diffuser, and the work of assembling the inflator body and the diffuser can be performed more easily.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The airbag device M1 according to the first embodiment is used for protecting the head. As shown in FIG. 1, the airbag device M1 extends from the front pillar portion PF around the periphery of the door opening W inside the vehicle to the roof side rail portion. An airbag 11 folded and stored to the rear side of R is disposed. The airbag device M1 includes an airbag 11
In addition, the airbag apparatus includes an inflator 20 that supplies inflation gas to the airbag 11 and an airbag cover 6 that covers the folded airbag 11.

The airbag cover 6 includes a pillar garnish 7 of the front pillar portion PF and a lower edge 4a of the roof head lining 4. When the airbag 11 is deployed and inflated, the pillar garnish 7 and the roof head lining 4 are separated. The lower edges 7a and 4a are pushed by the airbag 11 and open inside the vehicle.

The airbag 11 has an airbag main body 12 which inflates and inflates by inflating gas to cover the opening W.
A substantially cylindrical gas inflow portion 14 connected to the inflator 20 to allow inflation gas to flow into the airbag body 12;
A plurality of mounting portions 13 arranged on the upper edge side of the airbag 11
And is provided. The airbag 11
Is woven in a bag weave using polyamide yarn or the like so as to have flexibility, and in the gas inflow portion 14, long and short woven in a bag weave to improve heat resistance. An inner tube (not shown) is provided.

As shown in FIG. 1, a mounting bracket 15 is fixed to each mounting portion 13 from the front pillar portion PF to the inner panel 3 of the roof side rail portion R on the body 1 side. . In addition, before each bolt 16 is fixed to each mounting bracket 15,
A hook (not shown) is formed so that each mounting bracket 15 can be temporarily fixed by being locked in a locking hole (not shown) provided in the inner panel 3.

As shown in FIGS. 1 to 3, the gas inflow portion 14 is provided with a diffuser 38 of the inflator 20 which will be described later.
Are connected to each other using a clamp 18.
As shown in FIG. 5, the clamp 18 is made of sheet metal and has a substantially ring-shaped holding portion 18a having both ends separated, and a substantially ring-shaped holding portion having its inner peripheral surface welded to the outer peripheral surface of the holding portion 18a. And a plastic deformation portion 18b. At a substantially central portion along the circumferential direction of the plastic deformation portion 18b, a knob portion 18c bent in a U-shaped cross section is formed. Then, the gas inflow portion 14 of the airbag 11 is externally provided around the diffuser 38, the clamp 18 is externally provided therearound, the knob 18c is pinched, and the diameter of the holding portion 18a is reduced. The inflow section 14 is connected to a diffuser 38.

As shown in FIGS. 1 to 4, the inflator 20 includes a substantially cylindrical inflator main body 21 and a substantially cylindrical diffuser 38, and is provided on the body 1 side below the front pillar portion PF. It is arranged on the side panel 2.

As shown in FIG. 3, the inflator body 21 has an operation lead wire 34 connected to the base thereof, and an inflation gas is discharged by an operation signal input through the lead wire 34. It is configured to discharge from the outlet 24. Then, the inflator body 24 includes a tip side portion 22 on the gas inflow portion 14 side of the airbag 11,
And a base portion 29 on the lead wire 34 side.

The tip side portion 22 includes a plurality of gas discharge ports 24.
The head 23 has a substantially cylindrical head 23 with an opening, and a pressure contact portion 25 that expands in diameter toward the base from the head 23 in a truncated cone shape. And the outer peripheral surface of the press contact portion 25 is
The inflator 21 has a tapered surface 25a whose diameter is reduced toward the distal end side. The base portion 29 includes a reduced diameter portion 30 that reduces the diameter from the cylindrical body portion 27 toward the base portion in the shape of a truncated cone, and a connector 34 b of a lead wire 34 on the end surface 32 a side.
And a substantially cylindrical connector portion 32 for coupling the connector portion 32. Further, a step portion 31 protruding all around in the circumferential direction is arranged on the reduced diameter portion 30 side of the connector portion 32. ing. In the end face 32a of the connector portion 32, a connection port (not shown) is opened so that the connection direction of the lead wire 34 is constant, and the connection port (not shown) is, as shown in FIG. When the inflator 20 is properly fixed to the side panel 2 of the body 1, the lead wire main body 34a is set to extend downward from the inflator 20.

As shown in FIGS. 2 and 3, the diffuser 38 is made of sheet metal, has a substantially cylindrical shape having an inner diameter larger than that of the inflator main body 21, and covers the inflator main body 21 concentrically with the inflator main body 21. The diffuser 38 includes a cylindrical connecting portion 39 disposed at the distal end and connected to the gas inflow portion 14, and a connecting portion 3.
A pressure contact portion 40 which expands in diameter into a truncated cone from FIG.
The body 41 includes a body 41 that extends in a cylindrical shape in the direction toward the base and a fixing part 42 that is disposed at the end of the base.
The inner peripheral surface of the press contact portion 40 is a taper surface 40a that can be pressed against the entire outer periphery of the taper surface 26 of the press contact portion 25 of the inflator body 21.

The fixing part 42 is provided with a concave part 43 curved in a U-shaped cross section, and has an inner peripheral surface 43 a of the concave part 43.
Is in contact with the surface 31a of the step portion 31 of the inflator main body 21 on the base portion side and the entire outer peripheral surface 32b of the connector portion 32. In the case of the embodiment, the concave portion 43 constitutes fixing means for fixing the inflator body 21 to the diffuser 38, and is formed by plastic deformation by caulking.

Then, the tapered surface 40a of the press contact portion 40 is
The inner peripheral surface 43 a of the concave portion 43 is pressed against the tapered surface 25 a of the press contact portion 25 in the inflator main body 21, and the surface 3 on the base portion side of the step portion 31 of the inflator main body 21.
By contacting 1a and the entire outer periphery 32b of the connector portion 32, the inflator body 21 is supported and fixed to the diffuser 38, and the inflator body 21 and the diffuser 38 are assembled.

The state of support of the inflator body 21 will be described in detail. The tapered surface 25a, whose diameter is reduced toward the distal end, comes into pressure contact with the tapered surface 40a of the diffuser pressure contact portion 40.
The base side surface 31a of the step portion 31 is the diffuser fixing portion 4
By contacting the inner surface 43a of the second concave portion, the movement of the inflator body 21 in the axial direction is restricted. Also, the tapered surface 25a of the distal end portion 22 is
In the circumferential direction, the tapered surface 4 of the diffuser pressure contact portion 40
0a, and is supported at the base part 29
Is supported so that the outer peripheral surface 32b of the connector portion is surrounded by the inner peripheral surface 43a of the concave portion of the diffuser fixing portion 42 in the circumferential direction, so that the inflator body 21
The movement in the direction perpendicular to the axis is restricted, and as a result, the inflator body 21 is
It is fixed and supported in a stable state.

As shown in FIGS. 2 and 4, a mounting bracket 4 serving as a mounting portion for fixing the inflator 20 to the side panel 2 is provided on the body 41 of the diffuser 38.
4 are provided at two places along the axial direction of the diffuser 38. The mounting bracket 44 is formed of a bent sheet metal, and is connected to a substantially arc-shaped connecting portion 44a welded to the outer peripheral surface of the body portion 41. The mounting bracket 44 extends from one end of the connecting portion 44a radially outward of the diffuser 38. And a plate-shaped mounting base 44b. Each mounting base 44
A mounting hole 44c is formed in b, and each mounting bracket 44 is fixed to the side panel 2 by a mounting bolt 46 that is inserted through the mounting hole 44c and fastened to the side panel 2 of the body 1. The side panel 2 has a nut 2a for screwing each mounting bolt 46.
Are fixed.

Next, the assembling of the airbag device M1 and its attachment to the vehicle will be described. First, the folded airbag 11 and the assembled inflator 20 are prepared. The folding of the airbag 11 is performed by bellows folding so that the lower edge approaches the upper edge in a flat deployed state. Then, wrapping is appropriately performed with a breakable tape material, and a mounting bracket 15 is mounted on each mounting portion 13 so as not to be broken.

The inflator 20 is assembled as follows:
As shown in FIG. 6A, a diffuser 38 in a state before forming a concave portion 43 as a plastic deformation portion, that is, a diffuser material 36 is prepared in advance.・ 4
4 is fixed.

First, as shown in FIG. 6A, the connecting portion 39 from the base of the diffuser material 36 to the distal end thereof.
To the side, inflator body 21 is diffuser material 3
6, the entire circumference of the tapered surface 25 a of the distal end side portion of the inflator body 21 is pressed against the entire circumference of the tapered surface 40 a of the pressure contact portion 40 of the diffuser material 36.

At the time of the inserting operation, since the screwing assembly for rotating the inflator body 21 and the diffuser material 36 relatively is not performed, the periphery of the diffuser material 36 provided with the mounting bracket 44 and the inflator body 21 is not provided. The relative angular position along the direction can be set to a desired state. Then, even if the relative angular position is misaligned, the inflator body 21 can rotate around the axis of the diffuser material 36, so that the relative angular position is corrected to an accurate angular position. Easy to do.

Thereafter, as shown in FIG. 6B, with the tapered surface 25a pressed against the tapered surface 40a, the plastically deformed portion 43 of the diffuser material 36 is caulked, and the inner and outer diameters of the portion are reduced. When the inner peripheral surface 43a is brought into contact with the base side surface 31a of the step portion 31 of the inflator main body 21 and the outer peripheral surface 32b of the connector portion 32, the diffuser 38 is formed, and the inflator main body 21 is formed.
And the diffuser 38 are assembled.

Next, the connector 34b is connected to a connection port (not shown), and the lead wire 34 is connected to the connector portion 32 of the inflator body 21. At this time, since the relative angular position along the circumferential direction between the inflator body 21 and the diffuser 38 is in the desired state, the connection direction of the lead wire 34 is changed to the desired direction (in the embodiment, from the diffuser body 41). (The direction along the direction in which the mounting bracket mounting base 44b protrudes).

Thereafter, as shown in FIG. 6C, the gas inflow portion 14 is externally provided on the connecting portion 39 of the diffuser 38. Note that the clamp 18 is provided in advance on the gas inflow section 14.

Next, as shown in FIG.
A clamp 18 is provided around the gas inflow portion 14 provided with the gasket 9, the clamp 18 is reduced in diameter, the gas inflow portion 14 is connected to the diffuser connection portion 39, and the airbag 11 and the inflator 20 are assembled. The formed airbag assembly U is formed.

Then, the airbag assembly U is fixed to the side panel 2 and the inner panel 3 with bolts 46 and 16 and the airbag cover 6 is provided. Can be installed.

When a predetermined signal is input to the inflator 20 via the lead wire 34 after the airbag device M1 is mounted on the vehicle, the inflation gas is discharged from the gas discharge port 24 of the inflator 20, and the inflation gas is discharged. The airbag body 12 is supplied to the airbag body 12 through the gas inflow section 14 and
2 expands and expands greatly as shown by the two-dot chain line in FIG.

In the inflator 20 of the airbag device M1 of the embodiment, the entire circumference of the outer peripheral surface 25a closer to the base than the gas discharge port 24 in the distal end portion 22 of the inflator body 21 is assembled with the diffuser 38 at the time of assembly. The inner peripheral surface 40a is brought into pressure contact with the entire periphery and the inflator body 2
The first base portion 29 is fixed to the diffuser 38 by fixing means 43, and the inflator body 21 and the diffuser 38 are assembled.

That is, after the assembly of the inflator body 21 is completed, the diffuser 38 is provided at both ends of the distal end portion 22 (the pressure contact portion 25) and the base portion 29 (the step portion 31 and the connector portion 32). To be supported by
The diffuser 38 is stably supported.

Further, the pressure contact portion 25 of the distal end portion 22 of the inflator body 21 is pressed against the pressure contact portion 40 of the diffuser 38, and the fixing portion 43 is used to fix the base portion 20 of the inflator body 21 (stepped portion). 31
If the connector portion 32) is fixed to the diffuser 38, the inflator 20 can be assembled. Therefore, unlike the conventional case, the inflator body and the diffuser do not need to be rotated relatively long, and both can be easily assembled. it can.

Therefore, in the airbag device M1 of the first embodiment, the inflator body 21 and the diffuser 38 constituting the inflator 20 can be easily assembled, and the inflator body 21 can be stably supported. .

Of course, upon completion of assembly, the inflator body 2
The entire outer peripheral surface 25 a of the front end side portion 22 of the gas discharge port 24 on the base side with respect to the inner peripheral surface 4 of the diffuser 38.
Since the inflation gas from the gas discharge port 24 does not leak to the base of the inflator body 21 from the pressure contact portion, the sealing property of the inflation gas can be ensured because the inflation gas is pressed into the entire circumference of the inflator 21.

In the first embodiment, the outer peripheral surface of the inflator main body 21 to be pressed and the inner peripheral surface of the diffuser 38 are formed as tapered surfaces 25a and 40a which are reduced in diameter toward the distal end side of the inflator main body 21. Is simply pushed from the base side of the diffuser 38 to the front end side.
2 can be easily replaced with the diffuser press-contact portion 4.
Since it can be pressed against zero, the workability of assembling the inflator body 21 and the diffuser 38 is further improved.

In the first embodiment, the mounting bracket 44 for mounting the inflator 20 to the vehicle is
The airbag device M1 is provided in the diffuser 38, so that the number of components of the airbag device M1 can be reduced.
The workability of attaching the vehicle to the first vehicle can be improved.

Further, in the first embodiment, the fixing means for fixing the inflator main body 21 to the diffuser 38 is constituted by a plastically deformed portion 43 provided on the base side of the diffuser 38. By using only the plastic working, the base portion 29 of the inflator main body 21 can be fixed to the diffuser 38 without using a separate member, and the assembling work between the inflator main body 21 and the diffuser 38 can be performed more easily.

In the first embodiment, the mounting bracket 50 as a mounting portion for mounting the inflator 20 to the vehicle is integrated with the body 41 of the diffuser 38 by welding. And the diffuser body 41
May be formed so as to be integrally protruded from the formation site such as.

Further, the fixing part 42 is attached to the diffuser 38.
When the plastic deformation part 43 is provided as
Since the sealing property is secured by the surfaces 25a and 55a of the 55, the sealing property with the inflator main body 21 at that part is unnecessary, and the plastic deformation part 43 is brought into contact with the entire outer peripheral surface of the inflator main body 21. It is not necessary.

Next, an airbag device M2 according to a second embodiment shown in FIG. 7 will be described. This airbag device M2
Is configured similarly to the airbag device M1 of the first embodiment except that the inflator 50 has a structural difference.

The inflator 50 includes a substantially cylindrical inflator body 51 and a substantially cylindrical diffuser 6.
8 and a screw member 73 as fixing means. Further, similarly to the first embodiment, the gas inflow portion 14 of the airbag 11 is attached to the outer periphery of the distal end of the diffuser 68 by using the clamp 18. In the connected state, the mounting bracket 44 is fixed to the body by bolts 46.

The main body 51 of the inflator is formed in a shape in which a small-diameter cylindrical head 53 is disposed on the distal end surface of a long cylindrical body 57, and the distal side portion 52 is formed of a head 53.
And a pressure contact portion 55 on the distal end side of the body portion 57 disposed closer to the base portion than the head portion 53, and the base portion 59 of the inflator body 51 serves as a connector portion 62 for connecting the lead wire 34. , Is disposed on the base side of the body 57. The head 53 has a plurality of gas discharge ports 54 for discharging the inflation gas. Then, the inflator body 51 has an outer peripheral surface 55 that presses the surface of the pressure contact portion 55 on the distal end surface side of the body portion 57 against the diffuser 68.
a. Also, the end face 62 of the connector portion 62
A connection port (not shown) is opened at the center of “a” so that the connection direction of the lead wire 34 is constant.

The diffuser 68 has a substantially cylindrical shape having an inner diameter larger than the outer diameter of the inflator main body 51, and covers the inflator main body 51 so as to be concentric with the inflator main body 51. This diffuser 68
Is a connecting portion 69 for exteriorizing the gas inflow portion 14 on the distal end side.
And a body portion 71 which expands in diameter from the connection portion 69 and extends in a cylindrical shape to the base portion side.
A press-contact portion 70 extending in a flange shape is formed on the entire periphery on the inner peripheral side at the boundary between the body portion 71 and the body portion 71. The press contact portion 70 has an insertion hole 70 b through which the head 53 of the inflator body 51 can be inserted.
Is disposed at the center, and the surface on the base portion side is a portion of the inner peripheral surface 70a to which the outer peripheral surface 55a of the press contact portion 55 in the inflator body 51 is pressed. An external thread 7 as a fixing portion 72 is provided on the outer peripheral surface of the body portion 71 at the base portion side end.
2a is threaded.

The screw member 73 as a fixing means includes a disk-shaped bottom wall 73a and a peripheral wall 73d extending cylindrically from the periphery of the bottom wall 73a. A female screw 73e screwed to the male screw 72a of the diffuser 68 is formed on the peripheral wall 73a. Also, the bottom wall 73
a is provided with an insertion hole 73b at the center thereof through which the connector 34b of the lead wire 34 can be inserted, and when the female screw 73e is screwed into the male screw 72a to fix the screw member 73 to the diffuser fixing portion 72, the inflator body 51 A concave portion 73c is provided in which the connector end face 62a can be fitted.

In assembling the inflator 50 according to the second embodiment, first, the head 53 is placed first, and
The inflator body 51 is inserted from the base side of the diffuser 68 with the
a is brought into contact with the inner peripheral surface 70a of the pressure contact portion 70,
The connector portion 6 of the inflator body 51 is provided in the lid concave portion 73.
Then, the female screw 73e is screwed into the male screw 72a so as to fit the screw member 2, and the screw member 73 is mounted on the diffuser fixing portion 72.

When the female screw 73e is screwed into the male screw 72a, the screw member 73 presses the inflator body 51 toward the distal end, so that the outer peripheral surface 55a of the pressure contact portion 55 is pressed.
0 is pressed against the inner peripheral surface 70a. The screw member 73 may be tightened only if the screw member 73 does not simply come off from the diffuser 68 when the inflator 50 is actuated, and it is not necessary to consider the sealing property. This can be shortened, and can be performed more easily than the conventional long screwing operation of the inflator body and the diffuser.

When the lead wire 34 is connected to the connector portion 62 of the inflator body 51, the assembling of the inflator 50 is completed. Thereafter, as in the first embodiment, the inflator 50 is connected to the airbag 11, and What is necessary is just to form the assembly body U and attach it to a vehicle.

In the second embodiment, the inflator 5
0, the inflator body 51 and the diffuser 68, using a screw member 73 as a fixing means,
The press-contact portion 55 of the distal-side portion 52 is pressed and supported by the press-contact portion 70 of the diffuser 68, and the connector portion 62 of the base-side portion 59 is interposed with a screw member 73. 68 fixed part 72
, The diffuser 68 can stably support the inflator body 51.

Of course, when the assembly is completed, the inflator body 5
The entire circumference of the outer peripheral surface 55 a closer to the base portion than the gas discharge port 54 in the distal end portion 22 of the first peripheral portion 22 is the inner peripheral surface 7 of the diffuser 68.
Since it is pressed against the entire circumference of Oa, the sealing property of the inflation gas can be ensured, and substantially the same operation and effect as in the first embodiment can be obtained.

In the second embodiment, the case where the screw member 73 is provided with the concave portion 73c into which the connector portion 62 of the inflator body 51 is fitted, but if the screw member 73 presses the inflator 51 strongly, the inflator Since the main body 51 is strongly sandwiched between the press contact portion 70 and the screw member 73, not only the movement of the inflator main body 51 in the direction along the axial direction but also the movement in the direction perpendicular to the axis can be prevented. It is not necessary.

In the second embodiment, the screw member 73 screwed to the diffuser 68 is exemplified as the fixing means. However, if a fastening portion corresponding to the inflator body 51 and the diffuser 68 is provided, Bolts and nuts or rivets may be used as fixing means.

Next, an airbag device M3 according to a third embodiment shown in FIG. 8 will be described. This airbag device M3
The configuration of the airbag device M1 is the same as that of the airbag device M1 of the first embodiment except that the inflator 80 has a structural difference.

The inflator 80 includes a substantially cylindrical inflator body 81 and a substantially cylindrical diffuser 9.
, And the airbag 1 is attached to the outer periphery of the distal end of the diffuser 98 by using the clamp 18.
With the one gas inflow portion 14 connected, the mounting bracket 44 is fixed to the body by bolts 46.

The inflator body 81 is provided with
2 comprises a head portion 83 and a pressure contact portion 85 on the distal end side of a cylindrical body portion 87 disposed closer to the base portion than the head portion 83. The base portion 89 of the inflator main body 81 includes:
A stepped portion 91 recessed on the base portion side of the body portion 87, and a connector portion 92 disposed at the base portion end and connecting the lead wire 34
And, it consists of. A plurality of gas discharge ports 84 for discharging the inflation gas are formed in the head 83. A connection port (not shown) is opened at the center of the end surface 92a of the connector 92 so that the connection direction of the lead wire 34 is constant.

The diffuser 98 is made of a substantially cylindrical sheet metal having an inner diameter larger than the outer diameter of the inflator body 81, and is made concentric with the inflator body 81.
It covers the inflator body 81. The diffuser 98 includes a connecting portion 99 that covers the gas inflow portion 14 on the distal end side, a body portion 101 extending in a substantially cylindrical shape from the connecting portion 99 to the base portion side, and a fixing portion 102 at the base side end of the body portion 101.
And a press-contact portion 100 having a U-shaped cross section protruding inward in the radial direction over the entire circumference on the base portion side of the connecting portion 99. The fixing portion 102 has a concave portion 1 similar to the concave portion 43 of the first embodiment.
03 and one or a plurality of claw pieces 104 on the end face side. In order to reduce the weight of the diffuser 98, a predetermined number of meat hole 101
a is formed.

The concave portion 10 of the press contact portion 100 and the fixing portion 102
3 means that when the inflator 80 is mounted, the diffuser 9 is drawn so that the entire periphery is drawn from the cylindrical shape.
8 (diffuser material) is formed by plastic deformation. The inner peripheral surface 100 a of the press contact portion 100 is connected to the press contact portion 8 at the distal end portion 82 of the inflator body 81.
5 is pressed against the entire outer peripheral surface 85 a of the inflator body 81, and the inner peripheral surface 103 a of the concave portion 103 is separated from the surface 91 a of the step portion 91 of the inflator body 81 with a space on the base side and the bottom outer peripheral surface 91.
b.

The nail piece 104 is provided with a diffuser 98.
Are bent and plastically deformed from the state along the axial direction of FIG. 2 and are in contact with the connector end face 92 a of the inflator body 81.

In assembling the inflator 80 of the third embodiment, first, from the base of the diffuser 98 (diffuser material) in a cylindrical state that has not been plastically deformed, the inflator body 81 is placed with the head 83 at the top. Inserted to a predetermined position, and then caulked so as to reduce the entire circumference at the position where the pressure contact portion 100 of the diffuser 98 is arranged, and the inner peripheral surface 100a
Is formed so as to press-contact each other. Also, at the location of the concave portion 103, caulking is performed so as to squeeze,
The inner peripheral surface 103a is connected to the step 9 of the inflator body 81.
The concave portion 103 is formed so as to abut the base side surface 91a and the bottom outer peripheral surface 91b in FIG. Further, the claw piece 104 is bent and brought into contact with the connector end face 92 a of the inflator body 81.

When the lead wire 34 is connected to the connector portion 92 of the inflator body 81, the assembling of the inflator 80 is completed. Thereafter, as in the first embodiment, the inflator 80 is connected to the airbag 11, and What is necessary is just to form the assembly body U and attach it to a vehicle.

In the third embodiment, the inflator body 81 is fixed to the diffuser 98 without using fixing means separately, and the operation and operation are substantially the same as those in the first embodiment.
The effect can be obtained.

In the third embodiment, two plastically deformed portions 103 are attached to the fixing portion 102 of the diffuser 98.
Although 104 is provided, either one may be provided.

In each of the embodiments, the airbag device M1 for protecting the head is shown. However, the present invention is also applicable to other types of airbag devices such as a side collision airbag device attached to a seat. The invention can be suitably applied.

[Brief description of the drawings]

FIG. 1 is a front view of an airbag device according to a first embodiment as viewed from the inside of a vehicle.

FIG. 2 is an enlarged front view of the vicinity of an inflator of the airbag device used in the embodiment.

FIG. 3 is an enlarged vertical sectional view near an inflator of the airbag device used in the embodiment.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a perspective view of a clamp used in the embodiment.

FIG. 6 is a view for sequentially explaining an assembling step of the embodiment.

FIG. 7 is an enlarged vertical sectional view near an inflator of an airbag device used in a second embodiment.

FIG. 8 is an enlarged longitudinal sectional view of the vicinity of an inflator of an airbag device used in a third embodiment.

[Explanation of symbols]

Reference Signs List 11: air bag, 14: gas inflow section, 20, 50, 80: inflator 21, 51, 81: inflator body, 22, 52, 82: distal end portion, 24, 54, 84: gas discharge port, 25a / 55a · 85a · · · (inflator body side pressure contact portion) outer peripheral surface, 29 · 59 · 89 · · · base portion side portion · 38 · 68 · 98 · diffuser 40a · 70a · 100a · · (diffuser side pressure contact portion) inner peripheral surface, 44 ... ( Mounting part) Mounting bracket 43, 103 (fixing means / plastic deformation part) concave part 73: (fixing means) screw member 104: (fixing means / plastic deformation part) claw piece, M1, M2, M3: air Bag device.

Claims (4)

[Claims] 1. A cylinder-type airbag that is folded, housed, and can be deployed and inflated, and that connects a tubular gas inflow portion provided in the airbag and supplies inflation gas to the airbag. An airbag device comprising: an inflator, wherein the inflator covers a substantially columnar inflator body provided with a gas discharge port capable of discharging an inflation gas at a distal end side, and the inflator body. A substantially cylindrical diffuser for guiding the inflation gas discharged from the gas discharge port to the gas inflow portion, wherein the inflator body and the diffuser are disposed at a tip side portion of the inflator body. The entire periphery of the outer peripheral surface closer to the base portion than the gas discharge port is pressed against the entire periphery of the inner peripheral surface of the diffuser, and the inflation The former portion side portion of the over the body, and is fixed to the diffuser by fixing means, an airbag apparatus characterized by being assembled. 2. The air according to claim 1, wherein an outer peripheral surface of the inflator main body and an inner peripheral surface of the diffuser to be pressed against each other are tapered surfaces whose diameter is reduced toward a tip end side of the inflator main body. Bag device. 3. The airbag device according to claim 1, wherein the diffuser includes a mounting portion for mounting the inflator to a vehicle. 4. The airbag device according to claim 1, wherein the fixing means is constituted by a portion provided on the diffuser base portion side and subjected to plastic deformation. .